/* ==========================================================================
   HiRel Consortium – shared stylesheet
   ==========================================================================
   Barevný motiv: teal #00A99D (konsorcium). Odlišný od hirellabs (#4facfe).
   ========================================================================== */
* { box-sizing: border-box; }

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    text-align: center;
    padding: 20px;
    background: #000;
    color: #fff;
    margin: 0;
    line-height: 1.6;
    scroll-behavior: smooth;
}

/* --- Language visibility ------------------------------------------------ */
html[data-lang="en"] .cs-txt { display: none !important; }
html[data-lang="cs"] .en-txt { display: none !important; }

/* --- Skip link ---------------------------------------------------------- */
.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: #00A99D;
    color: #000;
    padding: 12px 20px;
    z-index: 999;
    text-decoration: none;
    font-size: 0.8em;
    letter-spacing: 2px;
    text-transform: uppercase;
    font-weight: 700;
}
.skip-link:focus { left: 20px; top: 20px; outline: 2px solid #fff; }

/* --- Navigation --------------------------------------------------------- */
nav {
    margin-bottom: 30px;
    padding: 14px 30px;
    position: sticky;
    top: 0;
    background: rgba(0, 0, 0, 0.96);
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    border-bottom: 1px solid #111;
}
.nav-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    height: 32px;
    width: 130px;
    text-decoration: none;
}
.nav-logo img { max-height: 100%; width: auto; display: block; }

.nav-menu {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    flex: 1;
}
.nav-menu > a,
.nav-drop-trigger {
    color: #00A99D;
    text-decoration: none;
    margin: 5px 14px;
    text-transform: uppercase;
    font-size: 0.75em;
    letter-spacing: 2px;
    transition: 0.3s;
    display: inline-block;
    cursor: pointer;
    user-select: none;
    background: none;
    border: 0;
    font-family: inherit;
    padding: 0;
}
.nav-menu > a:hover,
.nav-drop-trigger:hover { color: #fff; }
.nav-menu > a.active {
    color: #fff;
    border-bottom: 1px solid #fff;
    padding-bottom: 2px;
}
.nav-drop { position: relative; display: inline-block; }
.nav-drop-trigger::after { content: ' ▾'; font-size: 0.8em; opacity: 0.7; }
.nav-drop-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 240px;
    background: #050505;
    border: 1px solid #1a1a1a;
    border-radius: 6px;
    padding: 8px 0;
    margin-top: 8px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.7);
    text-align: left;
    z-index: 101;
}
.nav-drop.open .nav-drop-menu { display: block; }
.nav-drop-menu a {
    display: block;
    color: #ccc;
    text-decoration: none;
    padding: 12px 22px;
    font-size: 0.8em;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: 0.2s;
}
.nav-drop-menu a:hover { background: #0a0a0a; color: #00A99D; }

.lang-switch {
    display: flex;
    align-items: center;
    border-left: 1px solid #333;
    margin-left: 10px;
    padding-left: 15px;
    flex-shrink: 0;
}
.lang-link {
    color: #555;
    display: flex;
    align-items: center;
    gap: 5px;
    margin: 0 5px;
    text-decoration: none;
    cursor: pointer;
    background: none;
    border: 0;
    font-family: inherit;
    font-size: 1em;
    padding: 0;
}
.lang-link.active { color: #00A99D; font-weight: bold; }
.flag-icon { width: 18px; height: 12px; object-fit: cover; border-radius: 2px; opacity: 0.6; }
.lang-link.active .flag-icon { opacity: 1; }
.lang-separator { color: #333; }

/* --- Layout & container ------------------------------------------------- */
.container {
    background: #000;
    padding: 20px 50px 50px 50px;
    max-width: 1080px;
    margin: auto;
}
.logo-header {
    width: 100%;
    max-width: 550px;
    height: auto;
    margin: 30px auto;
    display: block;
}
.tagline {
    font-size: 1.1em;
    color: #00A99D;
    margin-bottom: 40px;
    text-transform: uppercase;
    letter-spacing: 3px;
    font-weight: 300;
}
.intro-notice {
    color: #ccc;
    line-height: 1.8;
    font-size: 1.05em;
    max-width: 780px;
    margin: 0 auto 60px auto;
    border-top: 1px solid #222;
    padding-top: 40px;
}

/* --- Typography --------------------------------------------------------- */
h1 {
    color: #fff;
    font-size: 2em;
    letter-spacing: 2px;
    margin: 0 0 25px 0;
    text-transform: uppercase;
    font-weight: 400;
}
h2 {
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 4px;
    font-size: 1.5em;
    margin: 80px 0 30px 0;
    border-bottom: 1px solid #111;
    display: inline-block;
    padding-bottom: 5px;
    font-weight: 400;
}

/* --- Section anchors ---------------------------------------------------- */
.section { scroll-margin-top: 100px; }

/* --- Grid --------------------------------------------------------------- */
.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
    text-align: left;
    max-width: 900px;
    margin: 0 auto 40px auto;
}
.grid-item {
    background: #050505;
    padding: 28px 26px;
    border: 1px solid #111;
    border-radius: 6px;
    transition: border-color 0.3s ease;
}
.grid-item:hover { border-color: #1e1e1e; }
.grid-item h3 {
    color: #00A99D;
    margin-top: 0;
    font-size: 1.05em;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
}
.grid-item p { color: #bbb; line-height: 1.7; font-size: 0.95em; margin: 0; }

/* --- Vision block ------------------------------------------------------- */
.vision-block {
    text-align: justify;
    max-width: 780px;
    margin: 0 auto 40px auto;
}
.vision-text {
    color: #ccc;
    line-height: 1.8;
    font-size: 1.02em;
    margin-bottom: 15px;
}
.vision-text.text-left { text-align: left; }

/* --- Partners grid ------------------------------------------------------ */
.partners-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 25px;
    margin: 0 auto 40px auto;
    max-width: 1000px;
}
.partner-card {
    flex: 0 0 300px;
    width: 300px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #050505;
    border: 1px solid #1a1a1a;
    border-radius: 8px;
    padding: 30px 25px;
    text-decoration: none;
    transition: all 0.3s ease;
    overflow: hidden;
}
.partner-card:hover {
    border-color: #00A99D;
    transform: translateY(-4px);
    background: #0a0a0a;
    box-shadow: 0 12px 30px rgba(0, 169, 157, 0.08);
}
.partner-logo {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    filter: grayscale(30%);
    transition: filter 0.3s ease;
}
.partner-card:hover .partner-logo { filter: grayscale(0%); }
.partner-card--lwr { padding: 14px 12px; }
.partner-card--lwr .partner-logo { width: 100%; height: 100%; object-fit: contain; }

/* --- Contact ------------------------------------------------------------ */
.contact-box {
    margin: 20px auto 0 auto;
    padding: 30px 50px;
    background: #0a0a0a;
    border-radius: 8px;
    display: inline-block;
    border: 1px solid #1a1a1a;
}
.contact-box p { color: #bbb; margin: 0 0 8px 0; }
.email {
    color: #00A99D;
    font-weight: bold;
    text-decoration: none;
    font-size: 1.2em;
}
.email:hover { text-decoration: underline; }

/* --- Buttons ------------------------------------------------------------ */
.cta-wrap { text-align: center; margin: 60px 0 20px 0; }
.cta-button {
    display: inline-block;
    padding: 15px 36px;
    border: 1px solid #00A99D;
    color: #00A99D;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 3px;
    font-size: 0.88em;
    transition: 0.3s;
}
.cta-button:hover { background: #00A99D; color: #000; }

/* --- Footer & back-to-top ---------------------------------------------- */
.footer {
    margin-top: 100px;
    padding-bottom: 40px;
    font-size: 0.75em;
    color: #444;
    letter-spacing: 1px;
    line-height: 1.6;
    text-transform: uppercase;
}
.footer a {
    color: #3498db;
    text-decoration: underline;
    transition: 0.3s;
}
.footer a:hover { color: #00A99D; text-decoration: none; }

#backToTop {
    display: none;
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 99;
    font-size: 12px;
    border: 1px solid #00A99D;
    background-color: rgba(0, 0, 0, 0.8);
    color: #00A99D;
    cursor: pointer;
    padding: 10px 15px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-family: inherit;
}
#backToTop:hover { background: #00A99D; color: #000; }

/* --- Media queries ------------------------------------------------------ */
@media (max-width: 1100px) {
    .container { padding: 20px 30px 40px 30px; }
}

@media (max-width: 750px) {
    nav { padding: 12px 16px; gap: 12px; }
    .nav-logo { width: 90px; height: 28px; }
    .nav-menu { order: 3; flex-basis: 100%; }
    .nav-menu > a,
    .nav-drop-trigger { margin: 5px 8px; font-size: 0.7em; }
    .nav-drop-menu {
        position: static;
        transform: none;
        margin-top: 5px;
        min-width: 100%;
        width: 100%;
        border-radius: 0;
        box-shadow: none;
    }
    .container { padding: 20px 20px 40px 20px; }
    .grid { grid-template-columns: 1fr; gap: 18px; }
    .partner-card { flex: 0 0 100%; width: 100%; height: 160px; padding: 22px 20px; }
    .partners-grid { gap: 18px; }
    .contact-box { padding: 22px 24px; }
    h2 { font-size: 1.2em; margin-top: 60px; }
}